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A negative loop is formed in the turning moment diagram because the pressure inside the cylinder is _______ than the atmospheric pressure.

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in Machine Dynamics by (34.3k points)
A negative loop is formed in the turning moment diagram because the pressure inside the cylinder is _______ than the atmospheric pressure.

(a) Equal

(b) More

(c) Less

(d) No pressure inside

This question was addressed to me in my homework.

Origin of the question is Turning Moment Diagram for a Four Stroke Cycle Internal Combustion Engine topic in chapter Turning Moment Diagrams and Flywheel of Machine Dynamics

1 Answer

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by (38.6k points)
Correct choice is (c) Less

For explanation I would say: A negative loop is formed in the turning moment diagram of a 4 stroke IC engine because during suction the pressure inside the engine is reduced due to intake and has a lower value than the atmospheric pressure.

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